Malicious PDF — malware analysis report

Static analysis result for SHA-256 108fdb91ba0f5ac5…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 01:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0c53a111a392732988887eac18b17db SHA-1: 364ad4ad3957f3f6752ace96753e268f9bc71b79 SHA-256: 108fdb91ba0f5ac5158c3016a6376d2f7a4c87ea9112ce073a18492582f3350a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=36+vayadhinile+full+movie
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/nokirigitutasoravusafozok.pdf
    • http://abwingsde.com/uploads/files/tixufoworukazelobumijid.pdf
    • https://oncetrabzon.com/resimler/files/95629793914.pdf
    • http://zl369.net/userfiles/file/sizera.pdf
    • http://abwhopewell.com/uploads/files/jowegaxe.pdf
    • http://bavlas.lt/ckfinder/userfiles/files/pamomigobubefodeken.pdf
    • http://wahluenfty.com/userfiles/tamerovitamowozapuf.pdf
    • https://masukpt1.com/contents/files/43965599074.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/poduxupif.pdf
    • http://reanda.com/jingkelun/userfiles/files/20210907054841.pdf
    • https://frutalmente.pt/site/upload/file/dofolidiborurubuzomerum.pdf
    • https://stancijanegrin.com/userfiles/file/84220916758.pdf
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/83429401700.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e68c09c4a8346e9b9d4f7e43046f16f5/sewasejeluvubowafo.pdf
    • http://otvorene-srdce.sk/userfiles/file/raroxilejifijufogarebo.pdf
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/921659665.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f5faf7c18fdcdc2d6b868999d58849b2/bafarukoxaxiwuribikelama.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6d038fb8d5d80fc5ed40fcf8cf1b6fdc/belugotumubisafolov.pdf
    • https://saigonservices.vn/images/uploads/files/47474319554.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/45619163345.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76b8671a4---sigixegaruzudezugu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c51f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC51F 16792 bytes
font_01_sfnt_off0000dd31.bin
1f0b48200671fb6d499b75bc5496981f4792d38d2f8be6b58579838610c986be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD31 18860 bytes
font_02_sfnt_off00010df0.bin
118d5ba312a8181d392050783d8cc2a1a053fabde8e78d1d51bef7714d2f5f10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF0 10776 bytes

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